The work aims to prolong the preservation time of mango. With small tainon mangoes as experimental materials, the control groups included bare discharge group and normal low-density polyethylene fresh-keeping film group, while the experimental group included functionally modified films developed by laboratory. Under the condition of (12±1) ℃ and relative humidity of (70±5)%, the fresh-keeping experiment was carried out on mango. Gas composition in the packaging bags, sample weight loss rate, hardness, sugar content, titration acid content and VC content were determined and analyzed. Decay of two control groups of samples after ten days was serious and the edible value was lost. The functional fresh-keeping packages independently developed by the laboratory could make the air conditioning environment suitable for the storage of mangoes through its own air permeability with good preservation effects, and the preservation time was about 18 days. The functional fresh-keeping packages independently developed by the laboratory can effectively prolong the shelf life of mango.